Marketing Effectiveness Manager

I’m working with a FTSE-listed Fin Tech business going through a major growth acceleration in the UK. They’ve already invested in marketing mix modelling, experimentation frameworks, and data infrastructure. The foundations are there. Now they need someone who can unlock real commercial value from it.

This is not a model-building role. This is not a reporting-only role.

This is a commercial measurement leadership role (senior IC).

You’ll sit within the Marketing team, partnering closely with Data Science, Analytics, and channel owners across paid search, social, affiliates, brand, and emerging channels. Your focus will be on turning models and experimentation into smarter investment decisions. That means:

• Reviewing and refining existing MMM outputs (not building from scratch)
• Designing and prioritising incrementality and geo-based experiments
• Coaching channel managers on test structure, duration, and interpretation
• Making judgement calls mid-flight when results are unclear
• Translating complex analysis into clear, commercially actionable recommendations
• Presenting to senior stakeholders, including C-suite and Directors
• Driving marketing efficiency improvement over the first 12 months

This role is about commercial judgement as much as analytical capability.

• Someone who has owned measurement before, not just supported it.
• Experience owning incrementality testing and experimentation roadmaps
• Exposure to MMM (you don’t need to have built one from scratch)
• Strong Excel skills (SQL a bonus)
• Confidence presenting to senior non-technical stakeholders
• Commercial instinct — understanding when to stop, scale, or rethink spend
• Ability to operate decisively even when data is imperfect
• Sector background is less important than mindset. Ecommerce, marketplace, travel, fintech, scale-up environments would all translate well.

• You enjoy influencing how marketing budget is allocated
• You’re comfortable challenging channel narratives when the data tells a different story
• You can balance model outputs with real-world commercial context
• You’ve made calls on experiments before — not just analysed them
• You like working in fast-moving, high-growth environments
• You’re comfortable being in a London office 3 days per week

• You want to build MMM models from scratch
• You prefer purely academic econometrics work
• You don’t enjoy influencing stakeholders
• You want a purely technical data science role
• You’re looking for remote-first
• Salary circa £65k, with flexibility up to £80k for the right profile, plus flexible benefits.
• Hybrid working, 3 days onsite in central London.
• 2-stage interview process

This is a high-visibility role within a profitable, scaling business that’s doubling down on growth. If you’ve owned experimentation strategy and enjoy turning data into confident commercial action, I’d love to chat.

• Sponsorship cannot be provided

• You must have full right to work in the UK

• Pre-employment checks will be required